Automatic record changer



Oct. 23, 1951 D. WALLACH ETAL 2,572,634

AUTOMATIC RECORD CHANGER Filed April 10, 1948 11 Sheets-Sheet 1 0413917.Walladz BY fieo ge flat/15 ALMA M [M Oct. 23, 1951 l. D. WALLACH ETALAUTOMATIC RECORD CHANGER ll Sheets-Sheet 2 Filed April 10, 1948 wk Q llR -J R w w 3J3 M w .3 WN NQQ w u v. M, R as R an Q 8 1 a E Q N NR 3 F SQR w w i \h\ W g a: Q. 0 N6 M O 1.2 M g. s m j R 3w 2% n W in 2 N3 I! II H i Ms k wfi M TIM K W 3 W 4. 4 M V. E. B NNN Oct. 23, 1951 l. D.WALLACH ETAL 2,572,684

AUTOMATIC RECORD CHANGER Filed April 10, 1948 ll Sheets-Sheet 3I'I'I'I'Il" I 1 n p. Ital/ark BY ee (larL Maui CM HTTOR/VEYS Oct. 23,1951 I. D. WALLACH ETI'AL 2,572,684

AUTOMATIC RECORD CHANGER 'mIlllllHIi! I1 .Mll

I 124 r F o r g l 0 A I 1! I I 1 a I l INVENTORS fit til D. fiZlIaz/vOct. 23, 1951 w L Ac r 2,572,684

AUTOMATIC RECORD CHANGER Filed April 10, 1948 ll Sheets-Sheet 5INVENTORS 111 g 0. iVallar/t fimgje flarlt M M W Oct. 23, 1951 l. D.WALLACH ETAL 2,572,684

AUTOMATIC RECORD cnmcsa Filed April 10, 1948 11 Sheets-Sheet 6 INVENTORS[1001? .1). 1731142611 By fieofge larif WWW Oct. 23, 1951 D. WALLACHEIAL 2,572,584

AUTOMATIC RECORD CHANGER Filed April 10, 1948 I 11 Sheets-Sheet 7IIIIIIIIII INVENTORSK 71mg D Phi/a0? 6mg: that IITTUR/YEYS Oct. 23, 1951D. wALLAcl-l Erna.

AUTOMATIC RECORD CHANGER 11 Sheets-Sheet 8 Filed April 10, 1948INVENTORS Ji'tu'n D- lift/lat (1207i? l'larli Oct. 23, 1951 Filed April10, 1948 l. D. WALLACH ET AL AUTOMATIC RECORD CHANGER 11 Sheets-Sheet .1

mvskums 1111111122. fialiazk fiea ge tlarlf M M M I arromzys This -inven tion relates. to an improvedmeans tor automatically playing-phonographrecords, a d p t cula toa mpro ed: me ns w ere y: a p1 m1 t=e r c1r s may. be. p aye ertain optional sequences, or a, single recordmay be played.repetitively. v I v v i QI PZ I zi t ma c rec rd? p aers-2. common. Generallyghowever; such record playrs req i e th a stack.zo h u a ity of records-onZ the spindleor a horizontal turntable; andthe records drop successively: upon,.-the-:turn+ table b im en a o qa tueda the m le i n 0f; e. layin ofwone iacemof t e previously depositedrecord. In these c onven-, tionalrecord players, ,theincreasingweig-ht 1. of records deposited on the turntable imposes {.a

cumulative strain on the driye motor-whichzmay e th pe d t e. mo o a eatt 1-.last :of the records inthe group will not be;-p1ayed; at proper Ispeed. The records a must be; carefully tacke I i re at n i t i th ee nm and a record which is even slightly .warped may jamtfthe feedingdevice and, cause operational failure or breakageoi ,the record.

AUTOMATICREQORD CHANGER x 1 "Irving DuwallachfPort washingtom snaceorgeP I Clark,"New'York, N. Y., assignors to Associated I a rinevelopment&*ResearchmCorporation, New I v I P v York, Na-Yrgja corporation ot Ne'wYorkindiscriminate mixture thereoLbut in which each record isautomatically individually are 5.;

Itis therei'ore a. principal object Qfqt HB present invention to.provide. an "automaticfrecord player which (eliminates, or minimizes,these 1 and other defects and disadvantages oficonventional recordplayers andha's advantageous features and' operr ationalecharacteristicsnot ai'ltairialole. presenteiiuipmeirl t. .f I ,It is an objector thepresent lnv'eriti'onto'p'ro: vide f an automatic record player. in which,1 the record mountedior rotation in a vertical. plane, and 'in' which'therecorda are- I ed individually to Pla esmon rm ama e Ln a e i ur dwit .ineeziee'ett P e m t-e? no time is-there more than one.recordcarried by thetum e e l a t an -o iec 5 t t e: n e tiont P v d .arecord player in which may be loaded a large number of records-forexample, as many as twenty-tour records of ten inch or twelve inchhandled; thereby keeping operationalloads onthe machine at a uniform andminimum level.

It is another objector the invention toprovide anautomati record playerin-which each side of each record-may be played; in succession, one sideof;each'successive recordmay be played, or any one, record mayberepeatedly played according to the selection oroption of the operator,-It is .an object of the invention to provide a 3 record player having afull-floating tone-armto minimize the wear in the tracking grooveand o.make needle pressurerwithinv the groove independent of tone arm weight.

.Itis a further object of the inventiorr to provide a record player inwhich the magazine maybe loaded from above by simply stacking therecords within a compartment ;or chamber from which tlrieyarelaterfed:

:Itisanother object otithe invention to provide a record player havingimproved meansfor. conveying the records to playing position and returneing the played record to. the magazine. V -;,.;---It .isan object. ofthe invention: .to: provide a record player .in which warped recordswill be handled satisfactorily. 1 I 1 aa-It isstillanother object of-theinvention toprovide a recordplayer in which speaker opera ation isautomatically cut out at theend of one play and'is notcut inuntil'the'needlehas come into playing vposition onthe next; successiverecord. or record Zface, thereby preventing; any electrical noises.incidental tothe change-over from one record to: the next from appearingas Sp 01 n an: It is an object oi-the invention, to-provideanautomaticrecord player in which ten ;inch; a nd twelve inch records maybe indiscriminately'intere mixed, and -havin improved means foraccurately positioning the tone arm needlein playing 3 position.

mounted so as to min imize. the pos sibility of damage thereto.

Other features and advantages will be hereinutter described. a

In the accompanying drawings:

Fig. 1 is a side elevation of the device showing a record being playedand the record pickup arm at ready;

Fig. 2 is a plan view in partial section on lines 2--2 of Fig. 1;

Fig. 3 is a vertical sectional elevation of the record magazine showingthe pick-up arm in engagement with a record to be returned to themagazine;

Fig. 4 is a top plan view, partly in section, of the record magazine;

Fig. 5 is a front elevation of the magazine and record chute in sectionon lines 55 of Fig. 3;

Fig. 6 is a side elevation of the pick-up arm and record support arm camtaken on lines B6 of Fig. 2;

Fig. 7 is a vertical elevation taken on lines 1--| of Fig. 6;

Fig. 8 is an exploded perspective of the drive pawl for the cam of Fig.6 and the release means thereof;

Fig. 9 is a side elevation of the record magazine release means, partlyin section, and shown at the instant of release of a record into themagazine chute;

Fig. 10 is a side elevation, partly in section, showing the recordpick-up clamp actuating cams;

Fig. 11 is a front elevation of the record pickup clamp, said clampbeing illustrated in closed position;

Fig. 12 is a side sectional elevation of the record support arm spindle,the drive plate shaft and the driving and support discs;

Fig. 13 is a vertical elevation taken from the rear of the recordsupport arm and in section on lines I3-|3 of Fig. 12;

Fig. 14 is a side elevation of the tone arm position and supportmechanism, in section on lines l4-l4 of Fig. 2;

Fig. 15 is a side elevation of the tone arm positioning cams at thestage when the tone arm has been positioned for a twelve inch record,but prior to the release of the tone arm to drop on the record;

Fig. 16 is a sectional on lines |6--l6 of Fig. 15 illustrating the latchfor holding the tone arm against accidental movement when establishedfor proper engagement with a record of either ten or twelve inch size;

Fig. 1'7 is a view similar to Fig. 16 showing the operational positionof the actuating cams when the tone arm is swung outwardly to themaximum after a record has been played;

Fig. 17a is a side elevation of the tone arm cams and followers at thecommencement of play of a record;

Fig. 17b is a side elevation of the pick-up arm cam and followers in therest position;

Fig. 170 is an operational chart of the pick-up arm cam and the tone armcam;

Fig. 18 is a side elevation, partly in section, of the clutch dog forthe tone arm cam and the solenoid actuated latch thereof;

Fig. 19 is an end section of the clutch dog taken in section on linesIll-I9 of Fig. 18;

Fig. 20 is a view similar to Fig. 18 but showing the clutch dog engagedand at the commencement of rotation;

Fig. 21 is an elevational section on lines ll-2| of Fig. 1;

Fig. 22 is a vertical section showing the interior of the base chamberand the tone arm and the counterbalance means therein; and

Fig. 23 is a schematic wiring diagram.

Referring now to the drawings for a more complete description of theinvention as presently constructed, a base plate 50, which isadvantageously a rigid cover for a rectangular wiring chamber frame 5|supported on suitable vibration isolator feet 52 carries the framework53, the turntable standard 54, the operation motor 55. the tone armassembly, and the several operational cam and linkage assemblies whichfunc tion as later described.

The frame work comprises the rigidly braced side frames 56 and rearframe 51 which are advantageously formed from flanged aluminum shapes,riveted or welded according to preference.

The drive motor standard maybe a hollow rectangular structure withinwhich is the record drive motor 58 and a connection block or equivalent59 to which the various control circuits may be wired as laterdescribed. It is understood that the apparatus is intended forinstallation within the cabinet of a radio-phonograph combination or thelike and the respective control switches 60, BI, 62, 63 shown in thewiring diagram (Fig. 23) will be conveniently grouped on an accessiblecontrol panel.

The record drive motor 58 is reversible and governor controlled forconstant speed. Through suitable gearing the motor drives a shaft 65,which is rigidly mounted in ball bearings or equivalent supported in afixed housing 66 secured to the standard 54. The end of the shaft 65 istubular, as shown in Fig. 12, and aflixed to said tubular end is theturntable disc 61 having a resilient facing 68. The diameter of theturntable disc is less than that of the "label areathat is, theungrooved central portion of the record at which the label is aflixed.Said central areas have been standardized by record manufacturers andthere is no danger that the turntable disc will encroach upon theplaying surface of the record.

A record support arm 10 is pivotally mounted relative to the standard 54as on a bracket H at the base thereof, and is adjustably spring biasedfor rotation toward said standard. The support arm carries at its freeend a bearing housing 12 which is mounted on trunnions for limitedrotation in a vertical plane, and is resiliently held in parallelismwith the arm 10 by a spring 13 which loops about a projecting pin 14 andis carried in blocks 15 at the side walls of arm 10, see Fig. 13. Thebearing 16 mounts for free rotation a sleeve 11 to one end of which isaflixed a pressure disc 18, having a resilient facing, as shown. Disc 18is preferably of the same diameter as disc 61.

Slidably carried within sleeve 71 is a spindle which is urged outwardlyof disc 18 by spring 81 until arrested by the stop 19. The head of thespindle is slightly smaller than the conventional spindle aperture of aphonograph record and is tapering or conical so that it will enter saidrecord aperture freely and with relatively small clearance.

Spindle 80 is on a swing radius relative to the bracket H suitable tocause its tapered head to enter the tubular end of the shaft 65 when therespective discs 61 and I8 are brought into face to face relationship.When a record 69 is impaled on the spindle and the arm 10 swung intovertical position, said record is clamped between the resilient facingsof the concentric discs 68 and I8 and will be rotated as the turntabledisc 68 is driven by the motor. The tapered end of the spindle, itspermitted rearward movement with- ;in; its', housing, and the pivotalmounting; ,of the bearingJIi; permits said'spindle to freely enter theShafllfii. 1 I

s am... I

No more than one record iiS; ever-{carried ,by I

the drive disc and spindle, and thecdrive motor therefore is underconstant flOfl-duln operation, discounting, of 1 curse,v,the slightdifference in weight between-ten :inch" and twelveinch records. i

III

The record magazine includes a troughlike floor 82 which iscarriedbyithe'frame 53Iand inclines rearwardly .'-'to the sloping: rear,.wall of; a chute 83 for" delivering the: recordsto vpropenpos'ition forengagement by -the support" arm"?! 0. The

--floorx-forming J structures converge, so ntha't-Ithe floor;82 isV-shaped (seeFigs. 42 and 5) ;i and'=in termixed ten and twelve inch.records. standing thereon will have :their spindle. apertures @in'verticalxalignment. 1- At the rear of fioor'82 there are spaced lowwallsor' stops: 84 against which rests the loweredge of the rearmostrecord inthe magazine. Said stops arelocated .to extend along the pointsof tangencyof'the respective floor structures and the ten inch-ortwelvein'ch record standing there'onmAs shown in Fig. 4; there: is arelativelywide gap" or'slot'85 tothe" rear of the walls 8'4; and it isthrough this slot thataireleased record willpass into: the chute. I KWhen the"records are-stackedx'within the magazine, the rear faces of'the records 'm'akean obtuse angle with the plane ofthe floor members,

as shown in Fig. 9. The-floor BZ-issurfacedwith any suitable smooth, Iresilient rnaterial, "so that as a record is released fromth'e magazineas later explained, the remaining records will slideireara As indicatedin-Fig. 4, the side walls ofthe chute 83 are stepped, forming two"trackways or channels which are defined by the-base and'side walls 86,81 and 88, 90,for the respective ,zac-

commodation of ten inch or twelve inch-records. The vertical center lineof 5 the records when stacked in the magazine is in the common centerline of the respective channels and sincethe'ten inch channel (definedby-the side "walls 81) is inch and twelve inch records in properposition for impale'mentiby the-spindle 80 as the record support armswings forwardly through the slot 9I. If by chance a record should notbe picked up by 80 andiwas pushed away from: the'chute,

it would falltoward thebase of the arm lfliand i would be caught-by'thecushion-94; thereonw Brackets. 95 are secured to theunderside of .thefloor 82 and pivotally carry the soft-: rubber wheels 96 which engage;the upper surface or a ten inch or twelve inch record as it, traverses,the chute, to brake the speed of descent thereof. The wheels are loadedby coil springs 91, the loadload, The spread .ing effect whichincreases? h respective wheel mounts swing; outwardly .,,-irom {thevrear wall. 183;. -A twelve inch recordcauses therwheel mounts to swing,through as greater are than a ,ten, inchrecord, and the resultingincreased tension of the springs compensates1 ;for the; ad-

ditional. weight of a twelve; inch record, Each size of; record willtherefore pass along-its channel atapproximatelythesamespeedi a Themeans: ,for retrieving a the record; after; it

thaswbeen playedi-and 'for returningit to-the magazine; include a pairofr-arms I00 extending forwardly from "the: frame sides 56' and. fixedlymounted on a shaft I0Ia whichais-journaledin suitable-bearings;providedon csaid frame, At their forward ends the; arms, I00 are joined by ashaft I02 which rotatably carriesat itscenter,

the pick-up clamp ;l03.'.wSaid clamp,see E issa- 4 'and'1-1,comprisesjaws I04, J05 to the lower ends or which :are tamxed eth'e' cushionedgripping blocks I {I 06,:I 01; which engage, the record ias-later,explained. The upward extremities-of the jaws I 04., "@I 05 cross 1each 'other iscissors fashion, and each jaw structure has :piv'otallyattached thereto one ;-;of a pair of f U-shaped toggle brackets I00,

'I I0 The leg'szof saidbrackets'pivotally attach to a shaft having;aiireely rotatable 'sleeve III.

Pressure on the sleeve] II willtcausea rotation of -thegtogglemembersl08, H0 through'an' over.-

throw or dead center position and the jaws I04,

-I 05:,w'ill separate as :shown' in; Fig; .11 a suitable spring I09 willbe :placed under-tension" thereby.

An;v upward; force' exerted onlthe sleeve: III will cause the; jawstobedrawn sharply together'to close the clamp-j'awsismartly. -It will beunderstood that 'thespring means I09 provides for the snap closure ofthe jaws and the exertion of sufficient' resilient pressure on the"'record' to 'prevent ,it from slipping from between theijaws, A springI-I 2.1is anchored on a stud I I4 fixedto shaft I02,

and toy a suitable bracket I I5 on the clamp. This spring 2 holds theclampsubstantially at right angles-to'the arms I00 when-the clamp has noOpen la s" nd the radius or ation of the'arms .I00in'sures thatthe'clam'p laws will ays fit overthe'record 69 whenthe .latteris'to bereturned the'magazma V :frames 56, there are mounted a' cam" I-I'l and ablock 'I I8, disposed in 'the p'athbf a" roller 7 I20 fixed to the endof a rod I2I guided for movement 'adjacentan inner wall ofa'narm I00. Atits forward end the rod I2I carries apivot block 122 whichacts asadriver'for a bell rank I23 and'is pivotally attached to a leg thereoff(see Fig." 4).

'Said' bell crank 'is' pivotally mounted on a bracket II 241 fixed tothe=arm- I001 The other leg of "hell crank I23 has -arounded end whichrides within a groove "I25.provided at the end'of a sleeve I26'sli'clably carried on the rod I021 It willbe'seen thereforeathat"movement of the rod I21 longitudinally of the arm I00 willcausearotation or the bellcrank I23 and a consequent movement ofthessleeve I26 to the right or left of Fig; 1 1, de-

pendingupon the directionxof movement'of said rod,-: iTheiopposite endof'sleeve'l26 has another.

groove I28: within "which rides the" rounded end "of; a bell crank l 30aflixed to-a bracket I 3 I carried ion a: collar I32= which isrotatablecon shaft" I02. Linearimovement of sleeve I26 on 'the shaft l02 will therefore cause rotation of the bell crank I30 to exert either adownward or an upward pressure on the toggle sleeve III to which the endof one of the bell crank legs is slidably attached.

The three operational positions of the pick-up arms I are the "readyposition shown in Fig. l in which the clamp jaws are open to engage arecord, the pick-up" position shown in Fig. 3 in which the pick-up armshave descended to a position where the clamping jaws have engaged arecord, and an elevated position which is ap- .proximately that shown inFig. and in which the jaws of the clamp (not shown in Fig. 10) have beenopened to release the record to drop into the record magazine. Theoperation of the clamp is controlled by the movement of the rod I2I asaforesaid, and said rod is driven by engagement with the cam I II or thecam block I I8. With the pick-up arm at the ready position of Fi 1, theroller I is not in engagement with either the cam II! or the block II8.As the arms I00 descend to the pick-up position the roller I20 engageswith the surface of block H8 and at the broken line position of Fig. 10,the engagement of the roller with the sloping surface of the block .II8will commence to drive rod I2I forwardly,

which will urge the sleeve I26 to the left of Fig. 4. At the dotted lineposition of Fig. 10, the rod I2I has been driven forwardly sufficient tocause bell crank I30 to rotate clockwise until the toggle sleeve I IIhas passed upwardly through the overthrow position and the jaws havesnapped to closed position. The record is now gripped by the clamp.

At this point, the support arm I0 wiil have begun quickly to withdrawfrom the turntable disc, the operation of said arm and the pickup armsbeing controlled by a common cam, as later described. The support armspindle will be c ear of the record before upward travel of the recordbegins.

When the arms I00 are swung upwardly the roller I20 swings away from theblock II8 but there is no movement of shaft I2I and the clamp remainsclosed on the record. The weight of the suspended record rotates theclamp against the tension of the spring I I2 so that the record hangssubstantially vertically. As the arms swing upwardly to a position wherethe record is above the magazine platform 82, the roller I20 engageswith the underside of the cam I I1 and as it approaches the high spot ofthe cam the roller and its rod I2 I are drawn rearwardly, causing areturn movement of the sleeve I26 and an eventual opening of the clampto release the record into the magazine. The clamp jaws remain open,because the toggle linkage has passed through the overthrow position.

The pick-up arms I00 are counterweighted for easy, free movement. Tothis end there is provided a bracket I34 on each of the arms I00, saidbracket pivotally securing one end of a counterweight link I35. Theopposite end of said link is pivoted to a counterweight lever I36pivotally supported on the main frame as shown in Fig. 1. The end ofsaid lever adjustably carries the counterweight I31. It will beunderstood that there is a similar counterweight assembly for each ofthe pick-up arms I00.

Means are provided to sweep the upwardly swinging record toward the rearof the magazine so that when the clamp releases, the record will stackagainst the other records. Said means comprise a sweep arm I40 pivotallysupported at each side wall of the magazine base as indicated in Fig. 3.The upper extremity of each arm I40 is provided with a bracket whichswingably carrles a wire gate I4I of suflicient length to extendinwardly across the outer areas of a ten inch record. By suitable meansincluding the springs I42 and stops I43 the gates are normally held toextend across the magazine and are swingable inwardly toward the rear ofthe magazine as the record passes therethrough, but are restrainedagainst movement forwardly of their respective sweep arms I40. The sweeparms I are rotated forwardly and rearwardly by means of the connectinglinks I44 which are attached to links I45 carried at the ends of therock shaft IOI for free rotation thereon. A pin I46 on one or both ofthe links I45 is in the path of rotation of a pin I41 extending from acollar I48 afiixed to shaft IOI for rotation therewith. Rotation of pinI41 clockwise of Fig. 3 rotates link I45 outwardly, and link I44 isprojected outwardly against the tension of spring I49 by means of whichit is anchored to the side frame.

The forward movement of the sweep arms to the broken line position ofFig. 9 corresponds to the correspondingly designated intermediate upwardposition of the pick-up arms I00, at which point the record 69 haspassed through the respective gates MI. The record is thereby heldagainst outward movement. At about the time the record has been releasedto drop into the magazine the sweep arms I40 are swung rearwardly tourge the record to the rear of the magazine. As later explained, theshaft IN is oscillated quickly at that stage of operation, the pin I41withdraws rapidly from pin I46, and spring I49 reacts to swing arms I40back smartly.

It will be noted that a record is not turned around when it is returnedto the magazine. A record having a single playing face would, if themachine were kept in operation, return to the same playing position thatit originally occupied; there is no danger of the blank face of therecord coming into playing position.

The release of a record from the magazine is also synchronized with andactuated by movement of the pick-up arms I00. The record ejection meansincludes a lifter I50 which is vertically movable relative to themagazine floor and is normally slightly beneath the surface thereof. Thelifter I50 extends between the stops 84 at the rear of the magazine baseas shown in Fig. 4, and said stops 84 are so arranged that they supportthe rearmost record of the magazine so that its lower edge is alwaysabove the upper edge of the lifter. Therefore, the stops 04 are offsetslightly to the rear of the lifter. Upward movement of the lifter willraise a record so long as the record is held by, the stops 84. Whenstops 84 disengage, the record will slide off of the rearwardly slopingedge of the lifter and into the ten inch or twelve inch chute accordingto record size.

The lifter I 50 is at the end of a lever I5I which is fixed to a shaft I52 mounted in suitable brackets extending downwardly from the magazinefloor 82. At the outside of the magazine there is a rock arm I53 securedto the shaft I52 and said arm is connected by means of ,a link I54 to alever I55 pivotally mounted on one of the side members of the frame 53,see Fig. 9. The lever I55 has a pivoted latch I56 which is in the pathof operation of an arm I51 fixed to and extending downwardly from acollar I58 which rotates with shaft IOI. As the shaft IOI rotates toraise the arms I00 the end of lever I5! engages with the latch I56,which is held against clockwise rotation by a stop pin I60 against whichthe latch is urged by and I6! are therefore rotated clockwise of Fig. 9,with rock arm I53 drivingshaft I52 and rotating the lifter lever'I66until at-a picdetermined rotation of the shatt ll ll the liiter llillhas raised a record above the stops en; and-; the.,record is ejectedfrom the ma a i e. As; the shaftflfll rotates toreturn t arms-"I06 tofiready position thelever I51 snaps over the end of latch/I56 toposition itfor a succeeding operai'.ion. v I

,- It sh u d b em e e l wher mar h a considerable wei'ghtlot records inthemagazine because of the large magazine capacity; In order to'relievethe weight on the rear rno s t record at the instant. oi-release, andthereby insure that it will drop into the chute, we provided a; pivotedbracket I62 (see Fig.9);having a relatively softsurfaced roller. I63against which the rearmost record comes to rest. Said record istherefore supported byv the spaced stops-,8} and roller J63 in theaforesaid angular relationship with floor '62.. The bracket I62 vincludes a 'lever 1|, 64 which is pivoted on a shaft l65 heldin a'bearingsleeve I66, secured to the rear frame l i'l, A spring I61normally urges lever I6l in, rotation counter: clockwise of Fig, 9.Pivotally fixed ,to the lower end of lever (I64 there -isa dog I681having a nose Ilq' disposed in the pathof rotation of a trip ,I1Imounted on theshaft; IIlI for-.rotation therewith. As shaft IIH rotates,to lower the arm I00 to record pick up position, the nose I16 will passover the trip v I'II, A sshaft-Illl reverses ltsrotation. to raise ,thearms [66; the trip I'II willengage the nose I T Il and rotate the lever,I64, through a small arc clockwise. ofFig. 9,"whe'reupon theroller I63will urge the stack of records forwardly. At an instant which iscoordinated with' themovemnt ofthe lifter- I50 to release a record; thetripl'll I snaps. over'the end of the nose I10 (said trip having acamlike rear surface, asclearlyshown mime. 9) and a spring or the like(not shown). The levers 156+ ""their operation phases. Near the point ofmaximum upward travel oi the arms I06, at which point-the record-isreleasedaand the sweep arms I 1s'wing :irearwardlyjit ;is. desirable to:impart a sharp movement lotithecarms, anduthe cam is accordingly, givena; sharper :rise portion, .1 such as I81; showninFig.-17b; .1' i v9.11;.1 Obviously, thetoperation of. the record support arm '10must,be*synchronized with theoperation of the pickup mechanism and theejection of a; record from. the "magazine into the appropriate withflorisupport of;v the: records are swingably or resiliently mounted, or: have:suflicient internal play. to permit thence-movement of said mem-v berswhen external pressures or forces are applied thereto. The members, andrecordscah fled-thereby, are therefore. never subjected, durl s any butabnormal or maliciously imposed conditions, to forces which might damagethem. For example, .;the armv 10, is :freely'; swingable clockwiseof-.;F,ig. =1 The respective arms I89 and I 9!. are, mechanicallyconnected by means of a spring I 93 which tendstodraw the arms togetherbut is restrainedby. the cooperatingstops or blocks 194,; I95, Thereforeas the ,follower arm .168 rotates under theurging of the cam track Il6,th e arrnl 9-I,-wi1lfollowto impart movementilfto the irecord supportarm and' yet'arm spring I 61 thereupon pullsthe lever I64'andthe rollerI63 sharply rearwardly;v At the stage oi. op eration orthe lifter I50torelease a record from the magazine, the stack ofrecords is unsupportedand there is "no weight or, pressure on l theflrearmost record whichmight otherwisehave caused it to be clampedagainstthe rollerIBt and haveprevented its passage from therecord magazine;

It will be seenthattli'e operation of .the pick up arms Illll'and the'mechanisn'iactuated there- I ill may-be swungclockwise of Fig. .6.eventhough the arm ,ltaiswlocked against movement .independentlypfthecam track. The arm 10 may therefore be held manuallyagainstrotationduring operation of thecam I15, or may. be manually withdrawn fromrecord ,sclamping position.

withoutpossibilityof damage; r

Thesequence. or operations controlled by cam I'I5is. accomplished. throuh a single; complete I rotation of .the'cam, which .mustwtherefore stopby and associated therewith accomplished by d g V r V I v I V 7 brackets.20I,; 2ll2..- S hait flmalso has afllxed I18, I19, the fformerbeingattached to the end until the next sequence period is at hand. Cam I15is drivingly connected to a drive gear I98 only ,ior. one rotation oithe pain. The cam is fixed to a shaft 100 journaled in the .spacedthereto, a collar y from which 1 extends an arm IM piv taIly-carrying apawl 105 foroperative association with aratchet 206 freely rotatable onI S erman but keyed .to gear I98. A solenoid 20lhas anarmatureilldpivotally attachedto a lever,

which meshes with-a gear I82' aiiixed to shaft III I. The gear I'IS hasaiiixed theretojaniarmf I85 the,

end. of which carries va amirouewer, such as,

the rollerfIBB'Which rides withinthe cam track I tfw l bfi Q Y OsfIOmFig 8-;thatthe correspond-.-

I'I6. Therefore according to the path of the,

cam" track, the arm I85 will swingin a clockwise or counterclockwisedirection, oscillating the gears I18and l'liltolrotate shaft l'o'lthrough the arc's'necessa'ry to operate thepick-up and record 269supported in a bracket! II). The forwardi end of said lever,--see Fig.8, is shapedto pivotally receive alatch 2H extendingiorwardly thereof,

, said; latch being resiliently supported, asby spring '2 I2 The latch 2I I. has agradually sloping nose .a s showniand with the endwall llfi oflever 209 defines a. pocket 5 within which the .ter-,

minusof arm 2114 comes; torest,.as later described.

ing endof the-pawl 205 is not withinsaid pocket 2 I5,but will.nevertheless abutthe end; of wall 2 I4. gives pawl- 205 a limitedfreedom; Of

movement with respectto arm ZM. .The en age ment of the end or pawl 265.with wall 2, rotates the .gpawlaoif thearmllll sufliciently to disenga ethepawlfrom the ratchet206,.as-shcwn in Fig,

I 6 normally urges pawl 205 1 into -14 prin 11 counterclockwiserotation. When the sequence of operation requires the rotation of camI15, a switch hereinafter described energizes solenoid 201 causing acounterclockwise rotation of lever 209 sufficient to release the arm 204and the end of the-pawl 205, which by reaction of spring H6 is snappedinto engagement with a tooth of the ratchet 206 which is rotating withthe gear I98. The solenoid 201 is thereafter deenergized but the arm 204has by then cleared notch 2I5 of the lever 209 and the return of saidlever to its Fig. 6 position does not interrupt the rotation of the camI15, which remains drivingly connected by means of the ratchet 206 tothe driven gear I90. Just prior to the completion of one rotation of camI15 the arm 204 engages the sloping nose of the latch 2H camming itdownwardly and permitting said lever to reenter the notch 215. The pawl205 which had immediately previously engaged the end wall 2 I4 is alsobeing rotated clockwise of Fig. 8 to disengage from the ratchet 206, andat the end of one complete rotation of the cam I15, said cam isdisconnected from any power source and stops operation.

The tone arm assembly 225 is preferably fabricated from light aluminumstock and has a pair of arms 226, 221 which straddle the record when thelatter is in playing position as shown in Fig. l.

Suitably carried at the ends of the respective arms are the reluctancepick-ups or equivalent 228, 230 as is well understood in the art. Suchdevices have a stylus or needle which rides within the sound groove andtherefore traverse the face of the record. The tone arm assembly ismounted for free movement both perpendicularly of and parallel to theplane of the phonograph record. We prefer to carry the assembly on arigid post or bracket 23| extending upwardly from the base plate 50,said post having a ball or roller bearing 232 within which freely ridesa shaft 233. Said shaft terminates in a fork 234 which embraces the sidewalls of the tone arm assembly at the base thereof, and is securedthereto in the plane of the center of the tone arm by means of suitablebearings 235. This construction therefore permits the tone arm to rockwithin its forked supporting member 234 and to rotate relative to thepost 23l.

The tone arm shaft 233 is counterweighted to make it so freely floatingin rotative movement in the plane of the record that the stylus of thearm which is in playing position does not impose any appreciable sidepressure on the groove or sound track of the record. The shaft 233 isprecisely perpendicular to the plane of the turntable disc and ispreferably intermediate the playing area of the record so that there isbut a small angle of departure of the tone arm from the vertical fromthe commencement of play to the finish. The balance of the tone arm isachieved by a counterweight arm 236 affixed to the end of shaft 233, acounterwei ht 231 being adjustably mounted on said arm.

The plane of the record is in the vertical axis of the side bearings 235and the tone arm must be rotated on its bearings 235 to bring one or theother of the pick-up cartridges 228, 230 into playing position. Withinthe base chamber 238 of the tone arm assembly there are secured, in aplane perpendicular to the central transverse plane of the tone arm, theparallel rails 240 upon which ride a shaft 24! having circular discs242, 243 at the ends thereof. The discs and shaft therefore comprise ashiftable counterweight.

A fork 244 extends through a base aperture 245 and engages the shaft I.Said fork is pivotally supported on a bearing carried by a bracket 246,said bearing being in the vertical centerline of the tone arm as appearsin Fig. 14. The fork 244 terminates in a rounded end portion 241 whichrides between the spaced upstanding walls 248, 250 of a shift bracket25l. These walls have arcuate extensions, see Figs. 21 and 22, so thateven when the tone arm is swung to its maximum position outwardly of theplane of the record, end 241 will be between the spaced walls.

The shift bracket 25I' is supported for slidable movement parallel tothe tone arm, as on guide rail 252. Extending downwardly from bracket25! is a pin 253 which is engaged by the forked end of a shift lever 254pivoted on the base plate as shown in Fig. 2. Said lever is engaged byan armature or linkage 255 which is common to a pair of normallydeenergized solenoids 256, 251, and it will be seen that when one ofsaid solenoids is momentarily energized to attract the armature 255, thelever 254 will be thrown and will cause one or the other of the walls248, 250 to engage with the lever end 241 and urge the counterweightwheels 242, 243 from one side to the other of the tone arm base, therebyoverbalancing the tone arm to bring one of its arms into engagement withthe record face. It will be understood that the wheels 242, 243 arerelatively light, and are related to the inherent balance of the tonearm assembly that the tone arm swings gently from one to the other ofits angular positions and rests lightly on the playing surface.

It will be obvious that during the interval between the completion ofplay of one record face and the commencement of play of the succeedingrecord or record face the tone arm must be operated in synchronism withthe pickup of the played record and the placing of the succeeding recordor record face in play, as follows:

1. It must be centered to raise the stylus or needle from the playedsurface, and swung outwardly clear of the record to permit the removalof the record;

2. It must be held in an extreme outward position while the new recordis placed;

3. It must be swung toward the center of the record a distance dependingupon whether the new record is a ten inch or a twelve inch size so as toengage the record track at the commencement thereof; and

4. One of its arms must be placed against the face of the record whichis to be played.

To accomplish steps 1, 2 and 3, we provide the following mechanism:

A post 260 carries a ball bearing or equivalent 26| which slidablyjournals a shaft 262 concentric with the tone arm mounting shaft 233 andin the plane of the bearings 235. Shaft 262 carries a rigid head 263having end wall surfaces adjacent the tone arm preferably parallel tothe plane of the record. Said wall surfaces are equally above and belowthe plane of bearings 235. The tone arm wall adjacent head 263 is alsoparallel to the record. The head has pins 264, 265 which are in mutualalignment and equiradial with respect to shaft 262, and these pins ridewithin slots provided on the adjacent end wall of the tone arm base asshown clearly in Fig. 21. The slots are elongate so that when the head263 is withdrawn as later explained neither the head nor the rods 264,265 will interfere with the rocking of the tone arm on its bearings 235.It should be understood that the 13 rods 2, 265 never disengage from theslots the head 263 rotates freely with the tone arm as it tracks acrossthe recor a spring, 266, about shait 262- a u to theri htjof;hiqAiShaft2 6 81 is3onrnaled or rotation in st zfivandla po t or bra ketin. M ed 1 -;1 a s afl i9 1, ta ion there a h graduallyo s noth 2,3.in11-th e am 10 t 9 -1W m-3H at rest; vhe nosf 1 1; is. e .Jn p theot h by tnerzsprinsaziii andHtheheagLY-ZSQ is withdrawn relativeaato thetone-arm wall. The end of ;s haft;;252-=:isseated a 14 at a greaterangular displacement relative to shaft 282 than stop 290 will flirmit agreater rotation lotqlswises 1 than;

e um 2' is automatically, rotatecl: to; cause the shaft 262 to climb -on.the high facet of the cam track, urging ;,t e planar; Wall of head .253againshithe sidewall of the tone arm base; 'iherebyIotating a the atonearm yion its bearings, 2351-; 'SO"=',-:th8,t; :litS respeotlvet-arms226, 22.] -are-.- ;spaced: from: :the r p dr I 59 11 8 q a h-noseaflz1-is: not seated i h n tch 213;; the tone ar 'isr h ld a ainstrotation-on its bearings 2;35.-; i

3 lt will be understood-that rthegstatedtcoplanar p relationship 50f,-:the qrecord, the;ihead- 1 263;; and

the'tone arm side wall is by'iwayiof example only):

it '-.is only necessary to have" such relationship aswillzproducearrotation aofn the lone armnon bearings 235 sufllcient adequately,Ltoxgbring the respective arms; 226,,2 21: clear: of the :recordsiCarried-1 by thezshaift v 268- for rotatiomwith the earn 2] I fare, the{adjaoentl-y positioned; mutually from cam? 21!; as by1ithfSpaCer;-z],::see- Fig.'=14'; Fixed to, shaft 262 for cooperationwith' *theic'am214 js a snbstantiallyr triangular lever 211: havlnga roller 218 forengagement?withtthesslirface of ;cam 2 1,4'.- Freely rotatableon;shaft-2625.15 a

bell crank 280;, one leg r 281; ofwhich qoperatesas affollower for thesurface of cam.--:-2;'l5an'd *the other leg 282 ,05 whi h vis attached:by means of the spring 283 rtota latch: 284 pivotallygcarried onl 1ever2.1 1 and engaged hyra stopcnigtorre+ 'direction clockwisef St n it rtat o in Fig m.

,K'Iheshapes ot the respectiv escain s: -214";" 215 ami trollingiactorfor the positioning of the tonear m during thevyariouastag es pfroperation-:andr-the 3;

rotation of -,the-,,tone arm; (except when the tone arm? is engagedEWithQEhfi 1-record aandds 'followi'rig therecordgrooveliis"underathemcontrol (ifcain 214 and. the I follqwer lever211. The position of the ,tone armforaten finch, ortwelve'i-nch i recordis'established by the cooperation of ;the bell crank 81.1 a diugsJon os' Ba290:,wh h project this undeft'ension radially 41mm a piyota11ymounted; bracket 2,9,1; Bracket, 294i; is arranged; I berotated -throqghlaffixd l q hesnd -an Y Isee Fig.2, the reqfisgp both laterally Idisengaged fromr theTa'tche 303, 9.

. v he-m m ers 82' cours a saw thdr wn -rfromt, 12 srth snn t qnp sitin, fhqa zolfin i 2,93, ont ol eq by 9119 ,fni o swi h 3,2 '2' 1w ar -1maun d I n nth? rs o di uterori a eme t yaei he r twe ve mh r e rdr-a th,s olenoi d -iqg is locked lect call 9 111 ns gi one rotation, the arm304 snaps v'e h 3118;; to prevent fu rther iot'ationi tli-pa'xfil 305 is55. Such closure may advantageously be accomplished by a switch lever315 which overlies the lever 381 to be rotated thereby as the armature311 enters the solenoid 312.

As the cam 211 commences its rotation. its first operation is to drivethe shaft 262 to the left of Fig. 14 which brings the head 263 againstthe side wall of the tone arm 225 and enforces a rotation of said tonearm sufficient to straighten the same so that its respective arms areraised from the faces of the record. At this point the tone arm is atthe extreme inner portion of the. record groove and has rotatedsufficiently to bring the members 282, 284 to the right of the line ofstop 290 and the shifting of lever 211 and bell crank 288 with the shaft262 is without conflict with the said stops. As the shaft 262 is shiftedto the left into the Fig. 14 position, the cam follower 218 is placed inthe path of cam 214 and the cam follower 281 is placed in the path ofcam 215. The rotation of .cam 214 enforces a' clockwise rotation oflever 211 and a corresponding rotation of shaft 262 and head 263 whichswings the tone arm outwardly of the periphery of the record.

The head 263 is, in effect, mechanically keyed to the tone arm by meansof the pins 264, 265. It will be understood that two pins are employedprimarily to maintain balance; one pin would be sufficient to enforcerotation of the tone arm.

As the lever 211 rotates clockwise its latch 284 snaps over whichever ofthe stops 288, 298 is in operating position. It will be recalled thatthe bell crank 288 and the lever 211 are tied together by a spring 283,and bell crank 280 would be rotated clockwise with lever 211 if it werenot for the cam 215 which engages and rotates the follower 281, drivingthe crank 280 sufficiently counterclockwise to keep clear of the stop288. The engagement of follower 281 with the cam surface holds bellcrank 288 against rotation enforced by the increasing tension of spring283 as lever 211 is rotated clockwise of Fig. 17a.

Fig. 17 shows the position of the respective levers 211 and 280 justprior to the rotation of cam 211 sufficient to permit a counterclockwiserotation of said levers and the inward swing of the tone arm to thetwelve inch playing position. It will be noted that the spring 283 isunder tension and the arm 282 is engaging the stop 288. As cam 211continues its rotation, the follower 281 will come into the low area 281of cam 215 but the tension of spring 283 will hold the arm 282 againststop 288. As the cam 211 continues rotation the follower 218 will followthe descending path of cam 214 and the spring 283 will enforce thecounterclockwise rotation of lever 211 and correspondingly shaft 262until the latch 284 engages the opposite wall of stop 288, whereupon theneedle on one of the tone arms will be in proper position to be placedagainst the commencement of the track of a twelve inch record.

As the cam 211 completes its rotation the shaft 268 is driven by thereaction of spring 266 into the low spot 213 of the cam, therebydisengaging the head 263 from the tone arm to permit said tone arm toswing at one side or the other of the record, according to the positionof the counterweights therein.

The movement of shaft 262 brings the respective cam followers out of thetrack path of the cams, and the latch 284 and arm 282 out of the path 01the stop 288, so that the tone arm is completely free to track acrossthe record. The suspended weight of thelevers 211 and 280 is compensatedby the tone arm counterweight 231.

It is desirable at the stage of rotation of the tone arm when it is inposition to be placed against the record to prevent accidental swing ofthe tone arm. To hold the tone arm securely in its ten inch or twelveinch record position at the stage just prior to its release by the head213 to permit the appropriate tone arm to engage the beginning of therecord track as the tone arm swings freely against the record face,there is provided a spring latch 316 which is fixed to and extends fromthe lever 211 and has a detent face 316a which snaps over the end of thefollower arm 281. The detent 316 is spring biased so as to be normallyout of the path of arm 281 and we provide a short arcuate cam 31% whichprojects from the face of cam 211 and which urges the latch end 316ainto contact with the arm 281 as the tone arm is-brought to ten inch ortwelve inch record position. The latched position is shown in Figs. 15and 16. During the final rotation of the cam 211 the cam 316a disengagesfrom the latch spring 316. To prevent the follower arm 281 from strikingthe end of the cam 3 I 6b as the shaft 262 moves to the right of Fig.14, the arm may be suitably notched, as shown.

Also joumaled in bracket 260 is a cam shaft 311 which carries a gear 318in mesh with a gear 319 fixed to shaft 268. Gear 319 is half thediameter of gear 318 and therefore shaft 311 will rotate at half thespeed of shaft 268. Said shaft operates certain switches, as laterdescribed.

The ynchronism between tone arm operation and pickup and record releaseoperation is predicated upon the design and relative operating speeds ofcams and 211. Comparison of the operating characteristics of said cams,shown in Fig. 170, should be premised on the fact that cam 115 is driven50% faster than cam 211, by suitable gear ratios.

Mounted on a suitable control panel are a main switch 68, an order ofplay switch 61, a repeat switch 62 and a reject switch 63. The order ofplay switch has two three-position gangs 61a, 61b tied together forconjoint operation. Each extreme position sets up the circuit to play aside of each record in succession. Said extreme positions have beendesign. .ted R and L to denote "right and left sides of the record asviewed, for example, in Fig. 1 in which the tone arm is in position toplay the right side of the record. In other words, with the gangswitches 61a, 61b set as in the wiring diagram, Fig. 23, the right sideof each record will be played in succession. Similarly when theswitch-61 is thrown to the opposite extreme the left side of each recordwill be played in succession. At the center position, designated"N eachside of each record will be played before the succeeding record isintroduced to playing position.

The main switch 60 may advantageously comprise a conductive sweep arm320 to which the plus lead of the power source is connected, and threeconcentric arcuate contacts respectively 321, 322, 323 which aretraversed by the sweep arm as the same is rotated clockwise of Fig. 23to its final or operation position at which it is in contact with theend of contact 321.

Associated with the shaft 268 of the tone arm actuator cam are threeswitches; respectively 325, 326, 321 which are operated by therespective cams 328, 330, 331, see Fig. 14. Switch 325 is a double throwswitch, whereas 326, and 321 are single throw switches. Said switchesare arranged to be actuated during one rotation of the shaft 268.

Associated with the shaft 3" which is operated from shaft 268 throughthe 2 to 1 reduction gearing 3", 3I8, so that said shaft will operatethrough 180 degrees for each complete rotation of shaft 268, are theswitches 332, 333, and 334, the first two being single pole double throwswitches and the latter being a single pole single throw switch. Thesaid switches are respectively operated by the cams 335, 336, 331 on theshaft 3.

One of the double throw switches is somewhat schematically shown in Fig.21 as comprising a central contact arm 333a spring biased for normalcontact with fixed contact 333b, but fixed to an insulated rod 3330 tobe raised to close with contact 333d as said rod rises with the camfollower 333e. Contact 333a. will therefore close once with 333d andonce with 333e for each full revolution of shaft 311. Single pole switch334 may be similarly actuated.

Suitably mounted on the base plate 58 is a single pole single thrownormally open switch 338 having an arm 348 which will be engaged by theprojection 241 of the tone arm as the tone arm swings to the extremeinner portion of a record following the completion of play thereof. Thetone arm swing rotates arm 348 to close switch 338, and as the tone armis swung outwardly of the record the switch 338 reverts to open circuitposition.

Assume now that the machine is at rest with the respective switches asshown on the circuit diagram. Rotating switch arm 328 clockwise willenergize the tone arm cam clutch solenoid M2 by a circuit which goesfrom plus power through arm 328, segmental contact 322, conductor 34I,solenoid 312 to ground. As the solenoid 3I2 pulls in, the operationmotor 55 is energized by circuit including sweep arm 328, segmentalcontact 32i, conductors 342, 343, 344, switch 3 (now in closedposition), and thence through conductors 345, 346 to the motor andground. The pick-up clutch cam solenoid 281 is energized by a circuitwhich includes switch arm 328, segmental contact 323, conductor 341,solenoid 281, conductor 348, thencethrough the normally closed repeatswitch 62 to ground.

As the switch arm 328 leaves contact 322 at the end of its rotation, themotor 55 is maintained energized through a second circuit whichcomprises contact 32l, conductors 342, 35!, and 352 to switch 326 which,although held open by its associated cam 338 when the shaft 268 is atrest closes as the cam releases the switch arm 353 immediately aftersaid shaft begins rotation, and thence through conductors 354 and 346 tothe motor and ground. A record will have been released from the magazineand the record size responsive solenoid 293 will have been energizedfrom switch arm 328, segmental contact 32 I, conductor 342, thence alongconductors 343 to solenoid 293. Assuming that a ten inch record had beenejected from the magazine, switch 294 will have closed and the circuitcompleted Solenoid 293 brings stop 298 into operating position. As thesolenoid 293 energizes, it cuts in a holding circuit comprisingconductor 355, normally open switch 356, conductor 351, and the normallyclosed twelve inch channel switch 295 to ground. If a twelve inch recordis the next to be released from the magazine the switch 295 will beopened and the solenoid 293 will be deenergized.

It will be assumed that switch 6| is in the R. position. Immediatelyafter solenoid 312 is energized b the initial operation of switch 68, acir- 18 cuit will be made through conductor 342, 35 l con ductor 358,contact 362 of switch 325 which at the instant of operation of thesolenoid 3 I 2 is in open circuit position but is engaged by switch cam328 shortly after shaft 268 begins rotation, then through conductor 368to the upper throw arm of gang 6lb, thence through the R contact andconductor 36] to the solenoid 251 and to ground, it being understoodthat the solenoid 251 throws the tone arm weights to the left of Fig. 1and therefore causes the tone arm to rotate in counterclockwisedirection to position needle 238 in play.

Suitably after the solenoid 3|2 has clutched in shaft 268, the cam 328will release the switch arm 362 to open the circuit of solenoid 251; andthe switch arm being biased to close with the opposite pole of switch325, a circuit will be completed through the opposite pole of saidswitch, to apply power through conductor 358, switch 326, conductor 363,the second throw arm of gang 6|b thence to the lower R terminal throughconductor 364 to the record motor 58 and ground. It is to be understoodthat the application of current through conductor 364 drives the motorin the proper direction for right hand record play.

It should be understood that the use of the term switch arm includesalso what might more properly be called switch arm actuator, such as theactuators 362, 363 engaged by the cams 328. 338 in Fig. 14. It is alsoto be noted that in switch 325 the center pole is normally biased toclose with its left hand contact, as viewed in Fig. 23, so that whenshaft 268 is at rest, the record motor circuit is closed. However, thecam 328 is so arranged with respect to the actuator 362 that veryshortly after shaft 268 begins rotation, actuator 362 will be moved toopen the record motor circuit and close the tone arm shift circuit. Therecord motor must be deenergized during the pickup of a played recordand the placing of a new one. The latter actions are accomplished in ashort space of time because cam I15 rotates through its cycle fasterthan cam 21l, as previously explained. The single throw switch 326 isbiased to normally closed circuit position but is held open by the cam338 at rest.

At the completion of record play the tone arm will be at its mostcentral position on the record, and the swing of the operating arm 241will close switch 338. Solenoid 312 will be energized through conductors342, 343, 365, 366 and 34! to apply power to operation motor 55 andinstitute operation of the tone arm cam to withdraw the tone arm fromthe record. The pick-up solenoid 281 is energized through switch 338,conductors 366, 3, 318, 312, 313, the bridging arm 314 of gang 6m, andconductors 315, 341, and 348 to the closed repeat switch 62 and ground.

The tone arm will remain at the center area of the record until camshaft 268 has rotated sufficiently to retract the tone arm. Switch 338will therefore remain closed for several seconds. This is suflicient toenergize solenoid 281 long enoughto operate the drive clutch for cam I15and to hold the switch 3I4 closed until switch 326 closes to maintainmotor 55 in operation.

It will be understood that the respective switches 332, 333, 334 willhave been operating during the rotation of the tone arm cam 21I but saidswitches are ineffective to alter the electrical circuit as is obviousfrom the circuit diagram.

One may wish to take a record (or one side of a record when switch 61ais in N position) out of play before its completion. We provide, there-

